What horticultural method is used most often for vigorous rootstocks that do not produce good quality fruit or flowers?

layering
cutting
grafting

grafting

Explanation:

When there's rootstocks that are vigorous, but they do not tend to produce fruits or flowers of good quality, then the most common method to solve the problem in the horticulture is the grafting method. The grafting is a method which is base around keeping the roots, but making clear diagonal cuts on the branches, and then attaching on those places small branches from a desired flower or fruit. Since the rootstock is strong and healthy, it will be an excellent basis for the growth of the fruits or the flowers. The newly attached, or rather grafted flower or fruit small branches will get the nutrients and water from the rootstock, so very quickly they will merge with it, thus becoming part of it. They will not produce the fruits or flowers that the rootstock originally produced, but instead they will produce the flowers or fruits of the rootstock from which they have been cut and grafted to the new one.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

read more on -